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Solid-liquid-separation processing method, and hydrometallurgical method for nickel oxide ore

a technology of hydrometallurgical method and nickel oxide ore, which is applied in the direction of sedimentation settling tank feed/discharge, separation process, sedimentation settling tank, etc., can solve the problems of inability to increase the number of stages without limitation, limit the installation space and initial investment, etc., and achieve efficient solid-liquid separation processing. , the effect of reducing the initial investmen

Inactive Publication Date: 2015-11-26
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for achieving a solution with higher clarity even when using a smaller number of thickening apparatuses for multistage washing. This allows for a reduction in installation space and initial capital investment for a solid-liquid separation apparatus and efficient processing. Additionally, this method can be applied to hydrometallurgical processing of nickel oxide ore to achieve high recovery percentage of nickel and cobalt even with a small number of thickening stages.

Problems solved by technology

However, there are limits on installation space and on initial investment, and therefore, the number of the stages cannot be increased without limitation.

Method used

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  • Solid-liquid-separation processing method, and hydrometallurgical method for nickel oxide ore
  • Solid-liquid-separation processing method, and hydrometallurgical method for nickel oxide ore
  • Solid-liquid-separation processing method, and hydrometallurgical method for nickel oxide ore

Examples

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example 1

[0078]In the solid-liquid separation step of the hydrometallurgical method for nickel oxidation ore, solid-liquid separation processing was performed in such a manner that, with thickening apparatuses connected in multiple stages as illustrated in FIG. 2, multistage washing (by the CCD method) was applied to a leach slurry obtained in the leaching step, whereby solids (leach residue) contained in the leach slurry was separated therefrom to obtain a crude nickel sulfate solution (leachate). Hereinafter, conditions for the solid-liquid separation processing will be shown.

(Processing conditions)

[0079]Ratio of solids in leach slurry: 44.8% by weight

[0080]pH of the leach slurry: 2.3

[0081]Flow rate of the leach slurry: 249 m3 / hour

[0082]Washing liquid: process water having a low nickel concentration

[0083]Flow rate of the washing liquid: 225 m3 / hour

[0084]Number of stages in the CCD method: 6 stages

[0085]Volume of the thickening apparatus: 1500 m3 (the same in each stage)

[0086]In the foregoi...

example 2

[0087]In Example 2, the solid-liquid separation processing was performed in the same manner as in Example 1, except that the proportion of the first stage: the second stage was set to 50:50.

example 3

[0088]In Example 3, the solid-liquid separation processing was performed in the same manner as in Example 1, except that the proportion of the first stage: the second stage was set to 95:5.

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Abstract

A solid-liquid-separation processing method wherein solids in a slurry are separated and removed by applying multistage washing to the slurry, wherein the case where the number of connected thickening-apparatus stages is smaller, the clarity of obtained supernatant liquid is improved. In the solid-liquid-separation processing method wherein thickening apparatuses each equipped with agitation and sedimentation tanks having an overflow unit in a peripheral portion to discharge supernatant liquid and cylindrical feed well vertically arranged at a central portion are provided in multiple stages; multistage washing is applied to a slurry to separate solids in the slurry therefrom and obtain a solution from which the solids are removed, when a flocculant configured to flocculate the solids in the slurry is added, a flocculant predetermined proportion is added to a feed well in a first-stage thickening apparatus, and remainder of the flocculant is added to an overflow unit in a second-stage thickening apparatus.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a solid-liquid-separation processing method, and a hydrometallurgical method for nickel oxide ore. The present application claims priority based on Japanese Patent Application No.2013-008659 filed in Japan on Jan. 21, 2013. The total contents of the Patent Application are to be incorporated by reference into the present application.BACKGROUND ART[0002]In recent years, high pressure acid leach using sulfuric acid has been attracting attention as a hydrometallurgical method for nickel oxide ore. This high pressure acid leach does not include pyrometallurgical processing steps, such as a drying step and a roasting step, but includes consistent hydrometallurgical steps, and thus is advantageous in terms of energy and cost, and in addition, high pressure acid leach has another advantage that a nickel-cobalt mixed sulfide whose nickel grade is improved up to approximately 50% by weight can be obtained.[0003]Specifically, a hydro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22B3/00C22B3/08B01D21/24B01D21/01B01D21/08
CPCC22B23/043B01D21/01C22B3/08B01D21/2405B01D21/08B01D21/06C22B23/005B01D21/2427C22B23/0453
Inventor MITSUI, HIROYUKINAKAI, OSAMUKYODA, YOJI
Owner SUMITOMO METAL MINING CO LTD